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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net income (loss) $ 16,509,000 $ 5,041,000 $ (1,588,000)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 7,078,000 4,333,000 5,531,000
Amortization of marketable securities premium 68,000 34,000 37,000
Impairment charge on equity investee     1,068,000
Stock-based compensation 4,519,000 2,623,000 2,346,000
Provision for doubtful accounts   183,000  
Gain from deconsolidation of a subsidiary     (175,000)
(Gain) loss on disposal of equipment (8,000) 50,000 72,000
Return of equity method investments (dividends) 774,000   362,000
Equity in (income) loss of unconsolidated joint ventures (4,409,000) (111,000) 983,000
Deferred tax assets 2,340,000    
Changes in operating assets and liabilities:      
Accounts receivable (9,661,000) (5,333,000) 441,000
Inventories (12,401,000) (916,000) 8,862,000
Prepaid expenses and other current assets (798,000) (6,719,000) 2,936,000
Other assets (6,283,000) (104,000) (1,188,000)
Accounts payable 3,563,000 2,305,000 (3,137,000)
Accrued liabilities (3,445,000) 2,601,000 (4,010,000)
Other long-term liabilities, including royalties (1,151,000) 1,878,000 118,000
Net cash provided by (used in) operating activities (3,305,000) 5,865,000 12,658,000
Cash flows from investing activities:      
Purchases of property, plant and equipment (29,645,000) (19,855,000) (21,792,000)
Purchases of available-for-sale debt securities (9,645,000) (5,968,000) (8,725,000)
Proceeds from sales and maturities of available-for-sale debt securities 480,000 9,401,000 22,189,000
Net cash used in investing activities (38,810,000) (16,422,000) (8,328,000)
Cash flows from financing activities:      
Proceeds from common stock options exercised 1,670,000 2,536,000 268,000
Consideration paid to repurchase subsidiary shares from noncontrolling interests     (262,000)
Proceeds from bank loan 20,543,000 10,401,000 5,814,000
Proceeds from short-term loan from noncontrolling interest 1,834,000    
Payments on bank loan (19,066,000) (5,996,000)  
Proceeds from sale of subsidiary shares to noncontrolling interests 538,000 396,000 366,000
Formation of new subsidiary with noncontrolling interests 1,283,000    
Proceeds from issuance of Tongmei's common stock to redeemable noncontrolling interests, net of costs (1,077,000) 47,563,000  
Dividends paid by joint ventures to their minority shareholders   (2,238,000)  
Net cash provided by financing activities 5,725,000 52,662,000 6,186,000
Effect of exchange rate changes on cash and cash equivalents 551,000 3,605,000 (150,000)
Net increase (decrease) in cash and cash equivalents (35,839,000) 45,710,000 10,366,000
Cash and cash equivalents at the beginning of the year 72,602,000 26,892,000 16,526,000
Cash and cash equivalents at the end of the period 36,763,000 72,602,000 26,892,000
Supplemental disclosures:      
Income taxes paid, net of refunds 3,177,000 1,959,000 749,000
Supplemental disclosure of non-cash flow information:      
Consideration payable to repurchase subsidiary shares from noncontrolling interests, included in accrued liabilities   1,439,000 151,000
Reduction of noncontrolling interests in excess (deficit) of total consideration paid and payable in connection with the repurchase of subsidiary shares from noncontrolling interests   (1,398,000) (74,000)
Consideration payable in connection with construction in progress, included in accrued liabilities $ 2,974,000 $ 1,457,000 $ 1,447,000